I'm running a MongoDB container (mongo:latest) on Azure Container Apps, but I'm facing an issue when mounting a persistent volume for MongoDB data. The container works fine before mounting the volume, but fails to start once the volume is mounted.

Here is the summary of the issues found in the container logs: - File Exists Errors: The error message __posix_open_file:924:/data/db/WiredTiger.wt: handle-open: open, along with the error code 17 (File exists), suggests that MongoDB is unable to open the WiredTiger.wt file because it already exists.

- Operation Not Permitted: The error __posix_open_file:924:/data/db/WiredTiger.wt: handle-open: open, along with the error code 1 (Operation not permitted), indicates that MongoDB does not have permission to open the WiredTiger.wt file.

- Renaming of Unexpected Files: The logs show that MongoDB is attempting to rename unexpected files (WiredTiger.wt to WiredTiger.wt.56, WiredTiger.wt.57, etc.) when it encounters issues.

- WiredTiger Startup Failure: The message Failed to start up WiredTiger under any compatibility version. This may be due to an unsupported upgrade or downgrade. indicates that MongoDB is unable to start the WiredTiger storage engine.

- Fatal Assertion: The error Fatal assertion followed by the message Terminating. Reason: 1: Operation not permitted means that MongoDB has encountered a critical error and is terminating.

Steps Taken to Mount the Volume:

1. Created a Storage Account and added a file share (Access tier: Transaction optimized).
2. In the Container Apps Environment, added Azure File (SMB) and specified: -Storage Account Name -Storage Account Key -File Share Name -Access Mode: Read/Write
3. In MongoDB Container App, added a volume with: -Volume type: Azure File Volume -File Share Name: Chosen from step 2
4. In MongoDB Container App, under the Containers section, added a volume mount: -Volume Name: Specified volume from step 3 -Mount Path: /data/db

What I Have Tried:

1. In my MongoDB Container App, under the Containers section, on the Properties tab, fields Command override and Arguments override I tried to change permissions as following Command override = /bin/bash Arguments override = chown -R 999:999 /data/db && chmod -R 777 /data/db && exec /usr/bin/mongod I also tried Arguments override = -c "chown -R 999:999 /data/db && chmod -R 777 /data/db && exec /usr/bin/mongod"

and

Command override = /bin/bash -c "chown -R 999:999 /data/db && chmod -R 777 /data/db && exec /usr/bin/mongod"

2. Mounting volume to another directory /data/mongodb, then changing permissions for that directory and making this directory as working folder for MongoDB.

az containerapp update \
 --name mongodb-container-app \
 --resource-group rg-container-apps-4890 \
--command "/bin/bash -c 'mkdir -p /data/mongodb && chown -R mongodb:mongodb /data/mongodb && /usr/bin/mongod --bind_ip_all --dbpath /data/mongodb'"

Despite these efforts, I still encounter the same errors. Could anyone suggest what might be wrong with my setup or provide any guidance on resolving this issue?